← WoW API < IsLinuxClient
This is a boolean function which returns true if World of Warcraft is being run using the Linux client, it will return false with the Windows client under wine or OS X client run on other operating systems. Although there is no current official Linux client, the beta version of WoW had a Linux client, and the code retains a function to test for it.
eg
if IsLinuxClient() then s = "./myfile.xml" else s = "myfile.xml" end